Blank for armature coil-guards



(No Model.) 2 Sheets--Sheet 1.

W. S. BELDING. BLANK FOR ARMATURE COIL GUARDS.

No. 438,892 Patented July 29, 1890.

(No Model.) 2 Sheets-Sheet 2. W. S. BELDING. BLANK FOR ARMATURE COIL GUARDS.

No. 433,392. Patented Ju1y29, 1890.

UNITED STATEs P TENT OFFICE.

\VARREN S. BELDING, OF ENGLEW OOD, ILLINOIS.

BLAN K FOR ARMATU RE COIL-G UARDS.

SPECIFICATION forming part of Letters Patent No. 433,392, dated July 29, 1890.

Application filed November 2, 1889 Serial No. 329,069. (No model.)

To all whom it may concern:

Be it known that I, WARREN S. BELDING, a citizen of the United States, residing at Englewood, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blanks for Coil-Guards for Armatures; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to blanks for forming such coil-guards for armatures as are shown in an application filed by me July '7, 1888, Serial No. 279,314.

In the accompanying drawings, Figure 1 is a View of one of the blanks. Fig. 2 is a view of one of the coil-guards formed from the blank shown in Fig. 1. Fig. 3 is a view of another form of the blank. Fig. 4 is a View of one of the coil-guards formed from the blank shown in Fig. 3. Fig. 5 is an end View of a portion of an armature-core having upon it three coil-guards, one of which contains a coil. Fig. 6 is a side View of the section of core shown in Fig. 3. Fig. 7 is a transverse section through a portion of a core and coil. Fig. 8 is an end View of a Gramme ring provided with my coil-guards. Fig. 9 is a section taken through said ring. Fig. 10 shows a modification.

Referring to the drawings, A is the blank. It is stamped from a fiat piece of sheet metal or other suitable material capable of being bent after the blank has been formed.

The essential parts of the blank are the web A and the lobes A extending laterally from opposite sides of said web. Said web is substantially in the form of a parallelogram, and the sides of the lobes A directed toward each other are straight, ornearly so, While the outer sides of said lobes are round at each end. The lobes also extend a distance equal to their own width past each end of the side of the Web to which they are attached, so that every portion of the outer side of the lobe is at about the same distance from the margin of the web to which it is attached. By thus forming the web and the lobes a space A is left inclosed by the web and the ends of the lobes. It now the lobes A A are bent from the eye, with the bending-line on the side of the web A adjacent toeach lobe, the coil-guard is formed, as shown in Fig. 2.

The blank may have one or two more elements-via, one or two tongues A in the space A and joined to the web A at the sides of the latter between the lobes A as appears in Fig.3. piece of sheet metal, and there is a bendingline at each side of the Web A. By bending thelobes A A toward theeye and bending said tongues A A from the eye on the bending-lines aforesaid a coil-guard is formed, as shown in Fig. 4. The said tongue or tongues A may be of such length as seems most de sirable for securing the guard, as hereinafter described.

The blank may be stamped in either form in dies made for the purpose and may be made cheaply and very rapidly, and since the material fro m which such guards are formed is very light they add but little to the thickness of the part of the core upon which the coil is wound. The width of the web A is equal to the desired width of the coil, so that when the lobes A are bent up the space between The five parts of the blan k are a single said lobes shall be equivalent to the desired width of the coil.

I11 applying the guard to the core it is presented to the end of the core at the bobbinspace. \Nhen the Paccinotti rihg is used, as shown in Fig. 5, the form of guard shownin Fig. 4 maybe applied by pushing one tongue over the inner and the other over the outer face of the core between the radial and polar extensions 0 until the web A rests against the core 0. Another guard applied similarly to the opposite end of the same bobbin-space prepares that portion of the core to receive the coil. The Wire is now Wound round the complete bobbin-space between the lobes A one strand being placed beside theother until a single layer of wire quite fills the space between said lobes and the radial extension O. Another layer is now formed upon the first, the strands of wire in the second layer being held upon those of the first at the ends of the core by the lobes A of the guard A.

I the radial extensions is even full, and each layer is kept in place at the ends of the core by the lobes A I have found that these strands remain in place between the radial extensions so long as they are drawn taut, and that when any of them are allowed to become slack they tend to move out of place. I have also found that if the strands on the outer portion of the coil. are arranged in regular layers. around the ends of the bobbinspace and any of such strands are allowed to move laterally from the layers beneath them the strands so moving laterally are slaekened to such an extent as to allow them to rise between the radial extensions 0'; or, should any of the inner strands move laterally, then the outer strands will by such moving of the inner strands lose their support and tension and be free to undergo this displacement.

\Yhen my guard is used, the entire coil may be wound in full and even layers and the strands held against lateral movement by the lobes A A hence there is no loss of tension in any of the strands and the entire coil assumes and retains a correct form. \Vhen the Gramme ring is used, the guards are applied one against the other around the entire ring, as shown in Fig. 8. The guards are cut of the same size and of such size that the desired number will just fill the ring. Thus the ring is spaced evenly into equal bobbinspaces, and when each guard is wound full the coils are all properly spaced and contain equal quantities of wire.

I claim as my invention 1. A blank of sheet metal or other suitable material for coil-guards for armatures, such blank consisting of the web A" and lobes A, extending outward from opposite sides of the web and being extended beyond said web a distance substantially equal to their own width, and there being a space between said lobes equal to the width of the bobbin-space to which the guard to be formed from such blank is to be applied, substantially as shown and described.

2. A blank of sheet metal or other suitable material for coil-guards for armat-ures, such blank consisting of a web A and lobes A extending outward from opposite sides of the web and being extended beyond said web a distance substantially equal to their own width, and there being a space between said lobes equal to the width of the bobbin-space to which the guard to be formed from such blank isto be applied, and a tongue or tongues A extending outward from said web between the lobes A substantially as shown and described.

3. A blank of sheet metal or other suitable material for coil-guards for armatures, such blank consisting of aweb A and lobes A extending outward from opposite sides of said web and being extended beyond said web a distance substantially equal to their own width and having their ends rounded at the outer side, and there being a space between said lobes equal to the width of the bobbinspace to which the guard to be formed from such blank is to be applied, substantially as shown and described.

4. A blank of sheet metal or other suitable material for coil-guards for armatures, such blank consisting of the web A and lobes A extending outward from opposite sides of said web and being extended beyond said web a distance substantially equal to their own width and having their ends rounded at the outer side, and there being a space between said lobes equal to the width of the bobbinspace to which the guard to be formed from such blank is to be applied, and a tongue or tongues extending outward from said web between the lobes A substantially as shown and described.

In testimony whereof I aftix my signature, in presence of two witnesses, this 2+tth day of July, 1880.

VARREN S. BELDING.

Witnesses:

OYRUs KEHR, FRANK 0. SMITH. 

